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PHP & Symfony Cheat Sheet (DRAFT) by

This Cheat Sheet was created with these versions in mind : PHP 8.2 Symfony 6.3

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Truthy & Falsy

false
 (boolean)
Everything else
 
0
 (integer)
 
0.0
 & 
-0.0
 (float)
 
"­"
 (empty string) & 
"­0"
 (string zero)
 
[]
 (empty array)
 
null
 & unset variables

Operators

 
?:
 
$var = expr1 ? expr2 : expr3;
 
if (expr1 = true) {

    $var = expr2

else

    $var = expr3

}
 
$var = expr1 ?: expr2;
 
$var = expr1 ? expr1 : expr2;
??
 
$var = expr1 ?? expr2;

 
$var = isset(­expr1) ? expr1 : expr2

Note : isset(­$var) returns false when $var is not set or null

PHPMD, PHPSTAN snippets

PHPMD Suppress Warnings
Comment annota­tions on a class or a method
 
/** 
  * @Suppr­ess­War­nin­gs(­PHP­MD.L­on­gVa­riable) 
  * @Suppr­ess­War­nin­gs(­PHP­MD.U­nu­sed­Loc­alV­ari­able) 
  */

match() expression

The match() expression branches evaluation based on an identity check of a value. Unlike switch, it will evaluate to a value much like ternary expres­sions. Unlike switch, the comparison is an identity check (===) rather than a weak equality check (==).
 
$food = 'cake';
$return_value = match ($food) {
     'apple' => 'This food is an apple',
     'bar' => 'This food is a bar',
     'cake' => 'This food is a cake',
 };
 

Serializer wording

Run a command

run a generic symfony command :
 
php bin/co­nsole app:test
run a command giving PHP more memory
 
php -d memory­_li­mit=2G bin/co­nsole ...